Query Elasticsearchedit
[preview]
This functionality is in technical preview and may be changed or removed in a future release. Elastic will work to fix any issues, but features in technical preview are not subject to the support SLA of official GA features.
Vega data elements
use embedded and external data with a "url" parameter. Kibana adds support for
direct Elasticsearch queries by overloading
the "url" value.
With Vega, you dynamically load your data by setting signals as data URLs. Since Kibana is unable to support dynamically loaded data, all data is fetched before it’s passed to the Vega renderer.
For example, count the number of documents in all indices:
// An object instead of a string for the URL value
// is treated as a context-aware Elasticsearch query.
url: {
// Specify the time filter.
%timefield%: @timestamp
// Apply dashboard context filters when set
%context%: true
// Which indexes to search
index: _all
// The body element may contain "aggs" and "query" subfields
body: {
aggs: {
time_buckets: {
date_histogram: {
// Use date histogram aggregation on @timestamp field
field: @timestamp
// interval value will depend on the time filter
// Use an integer to set approximate bucket count
interval: { %autointerval%: true }
// Make sure we get an entire range, even if it has no data
extended_bounds: {
min: { %timefilter%: "min" }
max: { %timefilter%: "max" }
}
// Use this for linear (e.g. line, area) graphs
// Without it, empty buckets will not show up
min_doc_count: 0
}
}
}
// Speed up the response by only including aggregation results
size: 0
}
}
The full result includes the following structure:
{
"aggregations": {
"time_buckets": {
"buckets": [{
"key_as_string": "2015-11-30T22:00:00.000Z",
"key": 1448920800000,
"doc_count": 28
}, {
"key_as_string": "2015-11-30T23:00:00.000Z",
"key": 1448924400000,
"doc_count": 330
}, ...
For most visualizations, you only need the list of bucket values. To focus on
only the data you need, use format: {property: "aggregations.time_buckets.buckets"}.
Specify a query with individual range and dashboard context. The query is
equivalent to "%context%": true, "%timefield%": "@timestamp",
except that the time range is shifted back by 10 minutes:
{
body: {
query: {
bool: {
must: [
// This string will be replaced
// with the auto-generated "MUST" clause
"%dashboard_context-must_clause%"
{
range: {
// apply timefilter (upper right corner)
// to the @timestamp variable
@timestamp: {
// "%timefilter%" will be replaced with
// the current values of the time filter
// (from the upper right corner)
"%timefilter%": true
// Only work with %timefilter%
// Shift current timefilter by 10 units back
shift: 10
// week, day (default), hour, minute, second
unit: minute
}
}
}
]
must_not: [
// This string will be replaced with
// the auto-generated "MUST-NOT" clause
"%dashboard_context-must_not_clause%"
]
}
}
}
}
The "%timefilter%" can also be used to specify a single min or max
value. The date_histogram’s extended_bounds can be set
with two values - min and max. Instead of hardcoding a value, you may
use "min": {"%timefilter%": "min"}, which will be replaced with the
beginning of the current time range. The shift and unit values are
also supported. The "interval" can also be set dynamically, depending
on the currently picked range: "interval": {"%autointerval%": 10} will
try to get about 10-15 data points (buckets).